Circuit Builder

Drag battery, bulbs, resistors, switches and meters onto a 12 by 8 grid; the live solver shows voltage, current and resistance for every component.

What it does

• Battery, bulbs, resistors, switches, ammeter, voltmeter and wires
• MNA solver computes V / I / R live as the circuit changes
• Animated current dots move at a speed proportional to current; bulb glow tracks dissipated power
• Series and parallel preset circuits to drop in as a starting point

For UK primary teachers

Circuit Builder is part of the free EduMania Teaching Toolbox — 50+ classroom visualisers covering Maths, English, classroom utilities and wellbeing. No sign-up to try, designed for whiteboards and tablets, and aligned to the UK National Curriculum across EYFS, KS1 and KS2.

Open Circuit Builder now →